From c2e9f75dbf89db8e19615dc0b15b05f4d5698584 Mon Sep 17 00:00:00 2001
From: Ulrich Müller <ulm@gentoo.org>
Date: Wed, 8 Jan 2020 10:24:41 +0100
Subject: tools-reference/head-and-tail: Add another example for tail.
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The bad example is taken from the script referenced in bug 536654.

Signed-off-by: Ulrich Müller <ulm@gentoo.org>
---
 tools-reference/head-and-tail/text.xml | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'tools-reference/head-and-tail')

diff --git a/tools-reference/head-and-tail/text.xml b/tools-reference/head-and-tail/text.xml
index e2b7553..06f17de 100644
--- a/tools-reference/head-and-tail/text.xml
+++ b/tools-reference/head-and-tail/text.xml
@@ -36,6 +36,14 @@ To specify "the last five lines", use <c>tail -n5</c>. To specify "all
 but the first five lines", use <c>tail -n+6</c>.
 </p>
 
+<codesample lang="ebuild">
+# bad: drop first five lines, clumsily computing line count
+tail -n $(($(wc -l in.txt | awk '{print $1}') - 5)) in.txt &gt; out.txt
+
+# good: let tail count lines from the beginning of the file
+tail -n +6 in.txt &gt; out.txt
+</codesample>
+
 <warning>
 <c>head/tail -5</c> syntax is deprecated and not POSIX compliant.
 </warning>
-- 
cgit v1.2.3-65-gdbad